David is a research scientist who is giving a lecture to a class of students on how life began on Earth. Help him complete the sentences.
Scientists have found
containing fossilized cyanobacteria (blue-green algae). They show that life has been present on the Earth from early ages. Oparin and Haldane were two scientists who hypothesized that life needed reducing environments initially to appear. The ocean in the early ages was
(devoid of oxygen) and acidic.
Answers
Answer:
stromatolites and anoxic
Explanation:
i got it right
Related Questions
Which statement explains why the structure of sickle cells differs from normal red blood cells?
A
The gene mutation affects protein synthesis.
B
The gene mutation prohibits DNA replication.
C
The gene mutation inhibits the cell’s ability to produce tRNA.
D
The gene mutation affects the cell’s ability to produce ATP.
Answers
Answer:
a
Explanation:
The structure of sickle cells differs from normal RBCs because of the gene mutation that affect the protein structure.
Sickle Cells:
These cells look like a crescent moon. They are unable to transport oxygen. This cause anemia in the patient.
It is an inherited disorder in which point mutation in the lead to the different protein structure. This results in the sickled RBCs.
Normal blood cells are round in shape and able to transport oxygen.
Therefore, the structure of sickle cells differs from normal RBCs because of the gene mutation that affect the protein structure.
To know more about Sickle Cells,
https://brainly.com/question/3895081
List 2 examples of a human's first line of defense:
Answers
Answer:
The first line of defence (or outside defence system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils.
Give an example of interspecific competition.
Answers
does this help at all
Can you plz help me I don’t get it
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Answer:
Plant cells have a cell wall, chloroplasts, plasmodesmata, and plastids used for storage, and a large central vacuole, whereas animal cells do not.
Explanation:
QUESTION 1
How many pairs of ribs are in the human body?
O 6 pairs
O 12 pairs
O 9 pairs
O 16 pairs
QUESTION 2
Which facial bone forms the chin?
O The Mandible bone
O The Mandible & Maxillae bone
The Maxillae bone
O The Mandible, Maxillae & Zygomatic bone
Answers
Answer:
12 pairs
mandible
Explanation:
NEED HELP!!! WILL GIVE BRAINLIEST!! <3
Answers
Answer:
pollution
Explanation:
i guess I can only think of one
What is an observational study? How is it different from a controlled experiment?
Answers
Answer:
Observational study is when you observe your subject and take more notes rather that writing down quantitative data. Meanwhile, a controlled experiment is more quantitative.
Explanation:
MULTIPLE CHOICE QUESTION
Shivering helps maintain our bodies
homeostasis by increasing the body's
glucose level
temperature
fat cells
surface area
Answers
Answer:
Temperature is the correct answer
All organisms have names that
include
class and order
Family and location
order and family
genus and species
Answers
During gymnosperm reproduction, which structure produces a sticky liquid?
sperm
ovule
egg
seed
Answers
Answer:
B :)
Explanation:
Which of the following will most likely decrease genetic diversity?
А increased reproduction
B selective breeding
C mutations
D immigration
Answers
Selective breeding dangers reduced genetic diversity can result in certain insects or diseases attacking, which could be quite devastating. Thus, option B is correct.
What is the cause of selective breeding in genetic diversity?Selective breeding can contribute to a large reduction in the genetic diversity of farmed populations, endangering long-term evolutionary progress and limiting populations' ability to adjust to environmental changes.
Unknowingly selecting uncommon illness genes as part of a desirable characteristic might cause difficulties with particular organisms, such as the high prevalence of deafness in Dalmatian dogs.
Genetic diversity is typically reduced by selective breeding, since only a few individuals are employed to produce enormous numbers of offspring. The population's survivability may be impacted by this.
Therefore, selective breeding will most likely decrease genetic diversity.
Learn more about selective breeding here:
https://brainly.com/question/461245
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Can a male be a carrier for a sex-linked disease?
Answers
Answer:
yEs
Explanation:
cUz
Answer:
No i am pretty sure its only through male
Explanation:
Explain the strengths and weaknesses of Lamarck's theory of evolution.
Answers
There is no experimental proof of the lamarckism. New organs are not formed in organisms by their wish or requirement. 3.It is not necessary that an the acquired characters transmit into new
Answer:
Weaknesses are traits may stay around for longer that what their needed and Strengths are we adapt to our needs.
Explanation:
Lamarckism, a theory of evolution based on the principle that physical changes in organisms during their lifetime—such as greater development of an organ or a part through increased use—could be transmitted to their offspring.
I took the quiz and said this, I got it it right!
This graph shows the result of a test designed to measure the stopping power of a certain brand of brake pads.
During which time period is the automobile slowing most rapidly?
A)
Between 0 and 1 seconds.
B)
Between 1 and 2 seconds.
Between 2 and 3 seconds.
D)
Between 3 and 4 seconds.
Answers
Answer:
i donnnnnnnnnnnnnnntttttttt knowwwwwwwwwwwwwwww
Explanation:
i really dont know im just a 12 year old kid struggling with math
Why would it not make sense for the cell to wait to combine Okazaki fragments into one continuous lagging strand until the entire DNA molecule has been replicated
Answers
Answer:
Okazaki fragments are short DNA nucleotides sequences that are formed discontinuously and then combine into one continuous lagging strand with the help of DNA ligase, the endonuclease, and polymerase. It takes place before the entire DNA molecule has been replicated.
If the cell waited to combine Okazaki fragments until the entire DNA molecule had been replicated then the newly synthesized lagging strand that are still Okazaki fragments might already be packaged and inaccessible to the all essential enzymes that are ligase, polymerase, and endonuclease that help to generate a continuous leading strand.
What is a real world example of enzymes being used?
Answers
Answer:
Enzymes are used in the food, agricultural, cosmetic, and pharmaceutical industries to control and speed up reactions in order to quickly and accurately obtain a valuable final product. Enzymes are crucial to making cheese, brewing beer, baking bread, extracting fruit juice, tanning leather, and much more.
Explanation:
yessir
During protein synthesis, what does mRNA do?
A It strings together two complements RNA strands
B It constructs proteins out of random amino acids
It strings together two complementary DNA strands
D It delivers DNA's instructions for making proteins to the ribosome
Answers
Answer:
No direct answer but this might help out a little bit: <3
Explanation:
The mRNA is an RNA version of the gene that leaves the cell nucleus and moves to the cytoplasm where proteins are made. During protein synthesis, an organelle called a ribosome moves along the mRNA, reads its base sequence, and uses the genetic code to translate each three-base triplet, or codon, into its corresponding amino acid.
Answer:
D It delivers DNA's instructions for making proteins to the ribosome
Explanation:
Based on the chart, Which system interactions are dependent on the plant's ability to respond to the direction of
light?
A Option 1
B Option 2
C Option 3
D Option 4
Answers
Describe how the mutation has effected the protein coded by this gene?
Answers
Answer:
By changing a gene's instructions for making a protein, a mutation can cause the protein to malfunction or to be missing entirely. When a mutation alters a protein that plays a critical role in the body, it can disrupt normal development or cause a medical condition.
Question 20
0.5 pts
Which system is described below?
Function: Regulates body functions by chemicals (hormones)
Major Organs: Pituitary gland, Thyroid gland, Adrenal gland, Thymus, Pancreas
O Endocrine system
O Integumentary system
O Respiratory system
O Urinary system
Answers
Answer:
Endocrine system
The overall chemical equation that describes photosynthesis is shown below. 6CO2 + 6H20 - C6H12O6 + 602 During photosynthesis, what best describes the role of the compound with the chemical formula C6H120$? A. a product that is not useful because of its low-energy chemical bonds B. a product that is useful because of its high-energy chemical bonds C. a reactant that is useful because of its high-energy chemical bonds D. either a product or a reactant, depending on whether the cell needs to store energy or release energy
Answers
Answer:d
Explanation:
Because it can be stored or released
Which of these is NOT evidence that Maiacetus is an ancestor of a whale?
A.Short legs with long, flat fingers and toes
B.Skeletons found among fossils of sea creatures
C.Sturdy hip bones
Answers
Answer:
A
Explanation:
because whales dont have legs or fingers
3 type Leaves! DESPREATE HELP
make sure to say what type of tree they come from (instructions from teacher cant be from a a bush ONLY TREE)
explain the shape the margin and the venation
name 3! if correct ill give brainily thing a thanks and 5 stars!
Answers
Answer:
Birch tree leaves look like scratchy raindrops, like someone tore tiny pieces (Serrated) from them. The venation looks like a tree, a bunch of veins duplicating from only 1 .
Some oak tree leaves have serrated leaves or are completely smooth. Their venation look Dichotomous.
Pine tree leaves look undulate and the venation is pinnate.
i dont understand this i need help
Answers
Given the DNA template strand below type the complementary mRNA that would be made during transcription.
TATAGCGTACGGCTAT
Answers
Answer:
AUAUCGCAUGCCGAUA
Explanation:
How to write a discussion on macromolecules in a lab report
Answers
HELP ILL MARK BRAINLIEST!!!
Scientists studying a population of fruit flies observe that a small percentage of the population mates in the morning while the rest of the population mates at night. Scientists predict that over time the population that mates in the morning and the populations that mates at night will become different species. Which of the following best supports the scientists prediction that speciation will occur in the fruit fly population?
a. There will be fewer offspring produced in the population of fruit flies that mates in the morning than in the population that mates at night.
b. There will be structural differences in the reproductive organs of the fruit flies in the populations that mates in the morning and those of the fruit flies in the population that mates at night.
c. There will be increasing geographic isolation between the population of fruit flies that mates in the morning and the population of fruit flies that mates at night.
d. There will be an accumulation of genetic differences between the population of fruit flies that mates in the morning and the population of fruit flies that mates at night.
Answers
Answer:
B: There will be structural differences in the reproductive organs of the fruit flies in the populations that mates in the morning and those of the fruit flies in the population that mates at night.
Explanation: I just finished the quiz!
Use your codon chart and tell me what amino acids are coded for by the mRNA sequence AUG CGG UCC GGA
Answers
Answer:
Methionine, arginine, serine, glycine
Explanation:
Use a codon chart (attached below) to determine what amino acids are coded for by the strand of mRNA. Remember that codons are groups of three nucleotides in mRNA. So, read the nucleotides in groups of three (just as how they are separated by spaces) and from left to right.
To use this codon chart, identify the first letter representing the first nucleotide in the codon. Then, find the matching letter that's one of the four biggest letters in the middle of the chart. Identify the second letter, then find the matching medium letter in the chart, staying within the section of the first letter as indicated by the lines, and do the same process with the third. Repeat for each codon.
Thus, with this mRNA strand, the amino acids will be methionine, arginine, serine, glycine.
Compared to the distances between the planets of our solar system, the distances between stars are usually
A) much greater
B) much less
C about the same
Answers
Answer:
the distances are much greater
Explanation:
because stars have their own light and energy so they dont need to orbit planets or other stars.Planets dont have their own light so they need to orbit a star and a star is usually orbited by multiple planets (sorry for my bad english)
How does Mitosis support the Cell Theory?
Answers
Answer: Mitosis occurs when the nucleus of the cell divides into two identical nuclei with the same number and type of chromosomes, followed by cytokinesis when the cytoplasm, for both plant and animal cells, divides, thus creating two daughter cells that are genetically equal and approximately identical in size.
Explanation: