Muscles differentiate from which tissue?
a. ectoderm
b. endoderm
c. mesoderm
d. gastroderm
e. morphogerm
C
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In several mammals, including some rat and shrew species, the presence of two X chromosomes means the animal will be a female, whereas having just one X chromosome dictates maleness. This type of sex determination is most similar to:
A. other mammals. B. insects. C. bees. D. birds.
Which of the following is a disadvantage of maintaining a large territory?
A. It will be energetically expensive to control and defend the territory. B. There will be a large diversity of food types within the territory. C. There will be ample room for nesting sites. D. There will be a large number of females that reside within the territory. E. All of the choices are disadvantages of a large territory.
Sodium and potassium ions need to be pumped simultaneously against their concentration gradients. Which one of the transport proteins would be most effective at this?
a. Uniport b. Antiport c. Symport d. Any would work, as they can all pump ions out.
During meiosis, chromosome number reduction takes place in ________
A) anaphase II B) anaphase I C) prophase I D) telophase II E) metaphase I