After a sperm penetrates the oocyte, the ovum's nuclear membrane disassembles and the two sets of chromosomes approach each other. At this point, the sets of chromosomes are called
A) mononuclei.
B) pronuclei.
C) gametocytes.
D) gametes.
B) pronuclei.
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The optimum temperature is usually closer to the minimum temperature than the maximum temperature
Indicate whether the statement is true or false.
The uncharged component of the atom is the
A. electron. B. proton. C. neutron. D. muon.
All of the following pertain to nitrogenous bases except
A. guanine pairs with uracil. B. they allow variation from one nucleotide to another which creates the encoded information. C. cytosine and thymine are pyrimidines. D. they form pairs by hydrogen bonding. E. adenine pairs with thymine.
Sexual reproduction _____
A) allows animals to conserve resources and reproduce only during optimal conditions B) can produce diverse phenotypes that may enhance survival of a population in a changing environment C) enables males and females to remain isolated from each other while rapidly colonizing habitats D) guarantees that both parents will provide care for each offspring