Which one of the following causes a disease characterized by the catarrhal, paroxysmal, and convalescent stages?
A) Bordetella pertussis
B) Corynebacterium diphtheriae
C) Mycobacterium tuberculosis
D) Streptococcus pyogenes
E) respiratory syncytial virus
A
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In 1910, Thomas Hunt Morgan discovered a white-eyed fruit fly in his population of wild-type, red-eyed flies. This white-eye phenotype occurs:
A. in all male and female fruit flies every other generation. B. only in female fruit flies. C. only in male fruit flies. D. only in offspring from a white-eyed male and a red-eyed female. E. in one-half of the male offspring from a red -eyed heterozygous female and a white-eyed male.
Which of the following is NOT true
concerning conifers? a. They form seeds in female cones. b. They have needlelike and scale-like leaves. c. They have a thick cuticle. d. They have motile sperm. e. They are mostly evergreen
Vasopressin is a hormone that is primarily released when the body is low on water. Release of vasopressin causes the kidneys to conserve water by concentrating urine and decreasing urine output. However, vasopressin also has additional functions in other tissues such as the brain and blood vessels, which are not directly involved in urine production. How could it be possible for vasopressin to trigger different responses in different tissues?
A. Vasopressin binds to the same exact receptor in different tissues, but causes a different conformational change to the receptor in each tissue. B. The kidneys have a receptor for vasopressin, but cells in the brain and blood vessels do not have a receptor for vasopressin. C. Vasopressin can bind to, and act on, different receptor subtypes, leading to different cellular responses in different tissues. D. Vasopressin can be released at different times to result in different effects.
This is a human hereditary disease that is caused by a dominant allele but does not show up in affected individuals until they are in middle age:
A. sickle cell anemia B. hemophilia C. Tay-Sachs disease D. cystic fibrosis E. Huntington's disease