Which part of a seed provides nourishment for the embryo, enabling seed plants to survive on land?
a) ovary
b) ectosperm
c) seed coat
d) endosperm
e) egg sac
Ans: d) endosperm
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Select all of the following that are names of immature stages in various animals.
_____ nauplius. _____ trochophore ._____ caterpillar. _____ nymph. _____ swimmeret.
Which cells stimulate B cells to divide and produce antibodies?
a. mast cells b. macrophages c. NK cells d. TC cells e. TH cells
Anury is the absence or abbreviation of the tail in animals, including sheep. It is inherited in an autosomal dominant fashion. A ram with anury is mated to a ewe with a normal tail. The ram's father had anury, his mother did not. What is the probability that the ram and ewe will produce a lamb with anury? (ram = male; ewe = female)
A. No chance B. 75% C. 25% D. 100% E. 50%
You step on something in the yard resulting in a puncture wound that does not bleed freely. Antigens from any microbes that entered the wound will most likely end up in the
A. appendix. B. lymph nodes of the groin. C. lymph nodes of the neck (cervical). D. lymph nodes of the armpit (axilla). E. spleen.