Question

In: Biology

1. Facilitated diffusion across a membrane requires_________. a. an energy input, but not a transport protein...

1. Facilitated diffusion across a membrane requires_________.

a. an energy input, but not a transport protein

b. a transport protein, but not an energy input

c. both a transport protein and an energy input

d. neither an energy input nor a transport protein

Active transport across a membrane requires_________.

a. neither an energy input nor a transport protein

b. an energy input, but not a transport protein

c. both a transport protein and an energy input

d. a transport protein, but not an energy input

Which one of the following statements about living organisms is an implication of the Second Law of Thermodynamics?

a. Living things can convert chemical energy into mechanical energy.

b. Living things require an energy input to keep them from breaking down.

c. Living things can convert one form of chemical energy into another form of chemical energy.

d. Living things can convert light energy into chemical energy.

Both prokaryotes and eukaryotes possess all of the following structures except_____.

a. chromosomes

b. ribosomes

c. a plasma membrane

d. an endoplasmic reticulum (ER)

During the process of transcription_________.

a. RNA nucleotides are base paired with DNA nucleotides

b. DNA polymerase moves along the template strand

c. a ribosome moves along an RNA strand

d. the genetic code is read

A wave of action potentials travels in a single direction down a neuron's axon primarily due to the

a. closing of voltage-gated K+ channels.

b. closing of voltage-gated Na+ channels.

c. inactivation of voltage-gated Na+ channels.

d. inactivation of voltage-gated K+ channels.

Solutions

Expert Solution

Ans-1) Facilitated diffusion across a membrane requires - (b) a transport protein, but not an energy input.

Ans-2) Active transport across a membrane requires - (c) both a transport protein and an energy input.

During active transport, molecules move against the concentration gradient from a region of low concentration to a region of high concentration. This requires energy aswell as transport proteins. Whereas, facilitated diffusion requires a transport protein but not energy as the solute molecules are transported down the concentration gradient.

Ans-3) The statement about living organisms which is an implication of the second law of thermodynamics - (b) Living things require an energy input to keep them from breaking down.

Ans-4) Both prokaryotes and eukaryotes possess all of the following structures except- (d) an endoplasmic reticulum.

Prokaryotes lack any membrane bound organelle that includes the nucleus, endoplasmic reticulum, mitochondria etc. Whereas , in eukaryotes all these organelles are present.

gladiator answered 1 year ago

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