Observe the photomicrograph on the right of an organism that was found growing symbiotically within the leaves of the water fern Azolla
(a) What is the common name given to an organism of this type?
(b) Give the name and function of the cell depicted by the line.
(a) What is the common name given to an organism of this type? Cyanobacteria or blue-green algae.
(b) Give the name and function of the cell depicted by the line. Heterocyst, functions in nitrogen fixation.
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Streptomyces produces geosmins which give soil a characteristic musty odor
Indicate whether this statement is TRUE or FALSE.
Other than the proteins that they encode, what is a major difference between cell-specific and housekeeping genes?
a. Cell-specific genes are expressed only in a single cell type; housekeeping genes are expressed in all cell types. b. Cell-specific genes have promoter proximal elements and enhancers; housekeeping genes have only promoter proximal elements. c. Cell-specific genes have promoter proximal elements that use cell-specific activators; housekeeping genes use "universal" activators. d. Cell-specific genes are only found in certain cell types; housekeeping genes are found in all cell types. e. Cell-specific genes have promoter proximal elements that use "universal" activators; housekeeping genes have promoter proximal elements that respond only to specific activators.
A fertility doctor is trying to determine why a couple is infertile. It has been determined that the woman is fertile, so the problem must be with her partner. In analyzing the partner's semen, the doctor notices that it seems to be lacking fructose
The structure malfunctioning must be the ________. A) bulbourethral glands B) prostate gland C) seminal vesicles D) urethra
People who wash their hands frequently during cold season typically have fewer colds than those who do not. This observation suggests cold viruses can be transmitted by
A) fomites. B) mechanical vectors. C) biological vectors. D) direct contact. E) both direct contact and fomites.