Which of the following is NOT a use for biotechnology?
A) Identifying human fetuses with particular genetic diseases
B) Producing effective and safe vaccines
C) Altering food plants to increase yields
D) Producing large quantities of particular human proteins
E) Altering the intelligence levels of newborn infants
E
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External fertilization is common in most _____
a. insects b. amniotes c. lizards d. bony fish e. hydra
When Pasteur tested the hypothesis of spontaneous generation, he compared the ability of a sterilized growth medium (meat broth) to produce a population of bacteria in two different types of flasks. One had a simple neck open to the outside, and the
other had a "goose neck" bend that also was open to the environment. Pasteur expected that bacteria would appear in the flask with the standard neck. In this experiment, the standard neck flask served as a/an: A) statistic. B) variable. C) control. D) observation. E) hypothesis.
If a pollen grain lands on the stigma of a plant of a different species
A. the pollen grain would be unable to form a generative cell. B. the pollen would likely not attach to the stigma. C. the pollen grain may not be able to germinate. D. the pollen grain would be too large or too small to enter the stigma. E. the pollen grain would be ejected from the stigma.
Negative feedback loops are __________.
a. activated only when a physiological variable rises above a set point b. mechanisms that most commonly maintain homeostasis c. analogous to a radiator that heats a room d. involved in maintaining contractions during childbirth e. found in endotherms but not in ectotherms