In most flowering plants, one sperm nucleus fuses with an egg forming a zygote that develops into an embryo. Another sperm nucleus fuses with ____
a. the endosperm mother cell to produce three cells, each with one nucleus
b. the endosperm mother cell, forming a diploid cell
c. the endosperm mother cell, forming a triploid (3n) cell
d. one of the smaller megaspores to produce what will eventually become the seed coat
e. one of the smaller megaspores to produce a diploid endosperm
c
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All of the following diseases are classified as ciliopathies except
A) Kartagener's triad. B) Bardet?Bieldl syndrome. C) Meckel?Gruber syndrome. D) Griscelli's disease. E) polycystic kidney disease.
Which of the following is true of the structure
labeled “C”? a. It is composed of tubulin subunits. b. It is composed of actin subunits. c. It is a microtubule. d. It is an intermediate filament. e. It moves chromosomes during nuclear division.
The hypothalamus and pituitary link the activities of the endocrine system and nervous system by
a. neurohormones being secreted in response to the summation of neural messages that enter the hypothalamus. b. shifts in hormonal concentrations being detected by the anterior pituitary. c. pheromones being secreted as a response to photoperiodic stimuli. d. the nervous tissue of the anterior lobe of the pituitary sending stimuli to the glandular tissue of the posterior pituitary to produce hormones that will be secreted by the hypothalamus. e. direct neural connections.
Of all the different codons that exist, three of them ____
a. are involved in mutations b. do not specify a particular amino acid c. cannot be copied d. determine amino acids, and in addition, also provide punctuation or instructions such as "stop" e. do not specify a particular amino acid, but do provide punctuation or instructions such as "stop"