A pollen grain is a(n) ________
A) female gametophyte
B) sporophyte
C) male gametophyte
D) integument
C
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Facilitated diffusion is an important method for cells in obtaining necessary molecules and removing other ones. Requirements for facilitated diffusion include
A. The carrier molecule must be specific to the molecule that is transported. The direction of movement is always with the concentration gradient, never against the gradient. B. The carrier molecule is nonspecific to the molecule that is transported. The direction of movement is always with the concentration gradient, never against the gradient. C. The carrier molecule is nonspecific to the molecule that is transported. The direction of movement is always against the concentration gradient, never with the gradient. D. The carrier molecule must be specific to the molecule that is transported and an ATP molecule must be attached to the specific carrier. The direction of movement is always against the concentration gradient, never with the gradient.
During animal development, a fertilized egg divides to form a ball of undifferentiated cells called a:
A. blastula. B. gastrula. C. meristem. D. zygote. E. neurula.
Which of the following is a true statement?
a) DO focus on the diagnosis and treatment of human diseases b) Vaccination is considered passive immunity c) Ebola's VP35, VP40 and VP24 block interferon production d) Interferon interrupts DNA replication directly e) Both A and C are true
Bacterial biofilms are composed of 95%
a. carbohydrates b. microorganism c. water d. DNA e. polysaccharide and water