Which of the following is NOT a characteristic of viruses?
A) They are visible with a light microscope.
B) They are acellular.
C) They are composed of genetic material and protein.
D) They are typically smaller than prokaryotic cells.
E) They are obligatory parasites.
A
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Reinforcement is most likely to occur when _____
A) the environment is changing B) hybrids have lower fitness than either parent population C) prezygotic isolating mechanisms are in place D) gene flow is low
Which of the following is false about earthworms?
a. They are the first group to have a rudimentary brain. b. They are scavengers, living on detritus. c. They have a closed circulatory system with multiple hearts. d. Each segment has muscles, blood vessels, and nerves. e. Paired nephridia cleanse the coelomic fluid and discharge wastes.
An individual who is a carrier for a sex-linked trait such as hemophilia
A) cannot pass the gene on to his or her daughters. B) is always female. C) is homozygous for the recessive condition. D) shows the dominant phenotype.
Neurosecretory cells in the hypothalamus make ____, which are secreted into blood at the posterior pituitary.
A. adrenaline and prolactin B. prolactin and oxytocin C. antidiuretic hormone and oxytocin D. luteinizing hormone and oxytocin E. growth hormone and prolactin