BIOLOGY HIGH SCHOOL

Which protein serves as a chemical messenger?hemoglobin
actin
myosin
insulin

Answers

Answer 1

Answer: D.) Insulin serves as a Chemical messenger.

Answer 2

Answer:

Answer:

Insulin

Explanation:

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Lifetime activities are activities that can be __________.

For the growth curve to continue increasing which of these must occur

Answers

Because most species have a high reproductive capacity, populations tend to grow if environmental conditions permit. The change in the size of a population depends on the rate at which new organisms enter the population, compared with the rate at which they leave. Natality is the number of individuals added to the population by reproduction per thousand individuals in the population. Mortality is the number of individuals leaving a population by death per thousand individuals in the population. If a species enters a previously uninhabited area, its population will go through a typical pattern of growth. Figure 17.8 shows a population growth curve, which is a graph of change in population size over time. There are four recognizable portions in a population growth curve: the lag phase, the exponential growth phase, the deceleration phase, and the stable equilibrium phase.

Which members of an ecosystem are part of the energy flow? A. ONLY the living things in the ecosystem B. ONLY the nonliving things in the ecosystem C. Living and nonliving things in the ecosystem D. The energy flow is not dependent on any members of the ecosystem

Answers

Answer:

D. The energy flow is not dependent on any members of the ecosystem

Explanation:

The energy flow in an ecosystem is not dependent on any member of the ecosystem. It is the flow of energy through the food chain, energy is passed from members in one trophic level to members in another or the next trophic level. The flow of energy in an ecosystem is important because it helps in maintaining balance in ecology.

What evidence suggests that vertebrates are more closely related to echinoderms than are any other invertebrate phyla? What evidence suggests that vertebrates are more closely related to echinoderms than are any other invertebrate phyla? a.Shared DNA sequences b.Shared morphology c.Shared patterns of development

Answers

Answer:

The correct answer is option a. "Shared DNA sequences".

Explanation:

The most reliable evidence that suggest that vertebrates are more closely related to echinoderms than are any other invertebrate phyla is the fact that vertebrates share DNA sequences with echinoderms. Among the different genes that have been analyzed between vertebrates and echinoderms, the genes involved in immunology and biomineralization are the ones practically identical among these two categories of species.

In response to a stimulus such as pain, a neuron sends a signal to the brain using __________.a. contraction and relaxation

b. electrical signals and chemical neurotransmitters

c. respiration and absorption

d. myosin and actin

Answers

The answer is b. electrical signals and chemical neurotransmitters.

Electric signals include action potential. When neurons hit threshold and action potential is triggered, the Na+ channels open and Na+ ions enter the neuron. After the depolarization of membrane, Na+ channels inactivate. Consequently, the action potential is generated.

When an action potential reaches presynaptic terminal on a neuron, it will induce a release of neurotransmitters from the neuron. Neurotransmitters pass through the synaptic cleft and bind to the receptor on a postsynaptic neuron.

Life as we know it depends on the genetic code: a set of codons, each made up of three bases in a dna sequence and corresponding mrna sequence, that specifies which of the 20 amino acids will be added to the protein during translation.imagine that a prokaryote-like organism has been discovered in the polar ice on mars. interestingly, these martian organisms use the same dna → rna → protein system as life on earth, except thatthere are only 2 bases (a and t) in the martian dna, andthere are only 17 amino acids found in martian proteins.based on this information, what is the minimum size of a codon for these hypothetical martian life-forms?

Answers

The right answer is 5.

To answer this question, we must think in the same way as the demonstration showing that codons of 3 are necessary to encode an amino acid (in terrestrial species).

To calculate the number of nucleotides in a codon in these new species: we should use the law of:

nucleotides existing ^ (number of nucleotides in a codon) = number of codons. (in order to have the number of possible codon combinations)

The number of codons must be greater than or equal to the number of amino acids (17).

2 ^ 1 = 2 (<17)

2 ^ 2 = 4 (<17)

2 ^ 3 = 8 (<17)

2 ^ 4 = 16 (<17)

2 ^ 5 = 32 (> 17)

32> 17 so the number of nulceotides in a codon must be 5.

Final answer:

The minimum size of a codon for the hypothetical Martian life-forms, which use only two bases (A and T) and have only 17 amino acids in their proteins, should be five bases. This size is needed to generate a minimum of 17 different codons.

Explanation:

The question is asking for the minimum size of a codon in these hypothetical Martian life-forms that use only two bases (A and T) in their DNA and have only 17 amino acids in their proteins. To analyze this, we must comprehend how codons function. A codon is a sequence of nucleotides in RNA that codes for a specific amino acid in a protein. In life on Earth, each codon is made up of three bases (each base can be A, T, C, or G), which makes for a total of 4^3 = 64 possible codons coding for 20 different amino acids.

However, in the Martian organisms, there are only two available bases (A and T) for constructing codons. In order to generate at least 17 different codons to code for the 17 different Martian amino acids, each Martian codon would have to be made up of at least 5 bases (since 2^4 = 16 is not enough, and 2^5 = 32 would be sufficient).