In females at puberty, what cells begin to secrete the major female sex hormone estradiol?

A. oocyte cells
B. granulosa cells
C. corpus luteum
D. follicle cells


Answer: B

Biology & Microbiology

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Communication between cells always involves four components, including a signaling cell, a signaling molecule, a receptor, and a target responding cell. Mark each of the following statements about cell communication true or false

____ Signaling molecules are always secreted from the signaling cell. ____ The distance travelled by the signaling molecule to the responding cell varies tremendously depending on the signal. ____ A specific signaling molecule may bind to receptors on more than one kind of cell. ____ Receptors for signaling molecules are always integral membrane proteins on the surface of responding cells. ____ Signaling molecules involved in endocrine signaling are always hydrophobic hormones like testosterone. ____ Peptide signaling molecules are only involved in paracrine or autocrine signaling. What will be an ideal response?

Biology & Microbiology

Answer the following questions true (T) or false (F)

1. If an Rh-positive woman marries an Rh-negative man, their children are at risk for hemolytic disease of the newborn. 2. Infection with certain viruses may lead to the development of type I diabetes. 3. Depletion of the helper T cell population by HIV results in the development of AIDS.

Biology & Microbiology

Plants are photosynthetic autotrophs. What does this mean?

A. The make their own food from organic materials. B. They require pre-formed organic compounds. C. They use light energy to drive the synthesis of organic molecules. D. They are considered to be the consumers of the biosphere.

Biology & Microbiology

Regardless of its shape, a given orbital may contain no more than:

A. 1 electron. B. 4 electrons. C. 8 electrons. D. 2 electrons.

Biology & Microbiology