The majority of protists reproduce ________ most of the time.
A. asexually
B. by parthenogenesis
C. by making eggs
D. by self-fertilization
E. sexually
Answer: A
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Given that people typically don't eat fruit seeds, humans play only a minor role in plant dispersal.
a. true b. false
Most small molecules are permeable across
a. both mitochondrial membranes. b. the inner, but not the outer, mitochondrial membrane. c. the outer, but not the inner, mitochondrial membrane. d. neither mitochondrial membrane.
What is the function of the sliding clamp in DNA replication?
a. unwind DNA ahead of the replication fork b. anchor DNA polymerase to the template strand c. remove DNA polymerase from the template strand d. anchor primase to the template strand e. bind to single stranded DNA to stabilize it before it is replicated
How are humans able to produce billions of unique B and T cell receptors?
a. Each time a pathogen is encountered, a new receptor is produced. b. The two different genes that encode receptor proteins, allow for many versions of receptors to be produced. c. Random splicing of gene segments encoding receptor proteins allows for 2.5 billion potential combinations. d. Antigen presenting cells stimulate B and T cells to each produce billions of receptor molecules. e. There are billions of B and T cells, each of which produces a single receptor on its cell surface.