ER is an abbreviation for _______ ________.
Fill in the blank(s) with the appropriate word(s).
Answer: endoplasmic reticulum
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A cell releases chemical signals into its surrounding space in order to communicate with neighboring cells. Which of the following must occur for the communication to be successful?
A) The chemical signal must bind to hormones on the neighboring cells B) The same chemical signal must be produced within the neighboring cells C) The neighboring cell must have the receptor to receive the signal
The midpiece of the mature sperm contains mitochondria that provide metabolic energy for the trip to the egg. Fructose (simple sugar) is used as fuel by the sperm. From where is this fructose secreted?
A) prostate gland B) seminal vesicles C) bulbourethral gland D) acrosome
Why must the transfer of electrons from glucose to oxygen during aerobic respiration take place in a series of steps?
a. The energy of the protons can be used to make ATP. b. The energy of the electrons can be used to make ATP. c. The energy of the electrons can be used to make ADP. d. It is chemically impossible to transfer electrons directly from glucose to oxygen. e. The chemical intermediates donate some of their electrons in order to increase the electron pool.
Duplicated chromosomes linked together at their centromeres at the beginning of meiosis are appropriately called what kind of chromatids?
A. Mother B. Parallel C. Sister D. Homogenous E. Haploid