A group consisting of a common ancestor and some, but not all, of its descendants is known as a ________ group
A) monophyletic
B) paraphyletic
C) polyphyletic
D) polytomy
B
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What do the results of research on gravitropic responses of roots and stems show?
A) Different tissues have the same response to auxin. B) The effect of a plant hormone can depend on the tissue. C) Some responses of plants require no hormones at all. D) Light is required for the gravitropic response. E) Cytokinin can only function in the presence of auxin.
Your dog has flu caused by an H3N8 strain. Assume that you breathe in this strain, after you have already come in contact with an H1N1 strain. Both viruses go into the cells of your upper respiratory tract. During the viral replication cycle inside of your epithelial cells, genetic information for hemagglutinin antigen and for neuraminidase antigen are recombined. Your cells end up producing a new variant---H3N1. Predict what might happen as a result of this set of events.
A. This is not a problem because the human immune system can respond quickly to any new antigens never seen before. B. Since this new virus has antigens from a dog strain, the new strain will not be able to infect human cells. C. This novel virus will spread through the human population without much resistance. D. Only people who have never had flu before will get sick from the new H3N1 variant.
Autosomal chromosome pairs are identical, whereas the sex chromosome pair in males is not
a. True b. False
Energy levels are regulated by a balance between the storage of glycogen and triglycerides known as (A) _____. Glycogen is stored in (B)___ and triglycerides are stored in (C)_______.
a. (A) catabolism (B) the liver and skeletal muscle (C) adipocytes b. (A) catabolism (B) adipocytes (C) the liver and skeletal muscle c. (A) anabolism (B) adipocytes (C) the liver and skeletal muscle d. (A) anabolism (B) the liver and skeletal muscle (C) adipocytes