Recombination at the synaptonemal complex always results in
a. two changed and two unchanged chromatids.
b. four unchanged chromatids.
c. four changed chromatids.
d. a random number of changed vs. unchanged chromatids.
e. one unchanged and three changed chromatids from two subsequent recombination events.
A
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Which of the following statements concerning complex multicellular organisms is true?
A. Plants and animals use bulk transport systems to move gasses and nutrients, but fungi and algae do not. B. Bulk transport systems require specialized organs like a heart to pump nutrients and dissolved gasses deep into tissues that are not in contact with the external environment. C. Bulk transport systems move substances faster than simple diffusion.
Schizophrenia, hypertension, and diabetes are ____
a. caused by a mutation to the same common allele b. believed to be diseases carried on the Y chromosome c. caused only by environmental factors d. caused by a single gene mutation e. considered to involve complex traits
Today, the major danger to species is:
a. hunting by humans. b. introduction of exotic species. c. destruction of habitats. d. predator control. e. commercial harvesting.
Answer the following questions true (T) or false (F)
1. B cell receptors are specific to only one antigen. 2. Antibodies may help phagocytes grab and ingest bacteria. 3. Smallpox vaccines used today are heat-killed cowpox viruses.