Behavior in which an individual animal gives up an advantage or puts itself in danger to aid others is called
A. habituation.
B. altruistic behavior.
C. observational learning.
D. dedication.
B. altruistic behavior.
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Male deer have large antlers that are used to challenge each other in fights for territory and females. The females of this group actively choose the strongest males. Which type of sexual selection is occurring with the deer population?
A. Stabilizing selection. B. negative frequency-dependent selection. C. Intersexual selection. D. Intrasexual selection. E. Intersexual and intrasexual selection are both occurring.
Homologous chromosomes
a. may exchange parts during meiosis. b. have alleles for the same characteristics even though the gene expression may not be the same. c. are in pairs, one chromosome of each pair from the father and one from the mother. d. pair up during meiosis. e. fit all of these descriptions
UV rays from the sun cause a specific type of improper base pairing called a thymine dimer. If a cell cannot correct this problem, the section of DNA can be removed, causing a deletion of several nucleotides. What will this cause?
A) A point mutation forms that leads to a change in one amino acid. B) A point mutation forms that leads to changes in a handful of amino acids. C) The codons shift by one letter, and all the codons before the mutation are changed. D) The codons could shift by one letter, and all the codons after that point would be off.
Vitamin D can be synthesized by the body from a derivative of cholesterol. Given this information, predict vitamin D's solubility.
A. Vitamin D is fat soluble. B. Vitamin D is not soluble in either water or fat. C. Vitamin D is soluble in both water and fat. D. Vitamin D is water soluble.