What is the structural and contractile unit of a skeletal muscle called?
Myofilament
Myofibril
Sarcoplasmic reticulum
Sarcomere
d. Sarcomere
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A scientist fused a mouse cell and a human cell, then treated the cell with specific antibodies
covalently linked to fluorescent dyes (antibodies to mouse proteins--green; antibodies to human proteins--red). What does the cell look like immediately after fusion?
a. The cell is half red and half green. b. The red and green fluorescent labels are uniformly distributed across the entire membrane. c. The red and green labels are distributed in intermingled patches. d. The red and green labels flash intermittently. e. The red and green labels are distributed in a swirling pattern
Which of the following is not true of the light-dependent reactions of photosynthesis?
A. They generate NADPH. B. They generate glucose from CO2 and H2O. C. ATP is generated by a chemiosmotic mechanism. D. The photons cause magnesium to release electrons. E. They occur in thylakoid membranes.
In the process of double fertilization, one sperm fuses with the egg and the other sperm fuses with a
synergid. ____________________ Indicate whether the statement is true or false.
When the fetal pituitary gland matures, it releases ________, which triggers the sequence of events referred to as "labor."
A) oxytocin B) ACTH C) LH D) prostaglandins E) FSH