The type of leaf arrangement in the accompanying figure is characteristic of:

a. ashes.
b. maples.
c. catalpas.
d. beeches.
e. buckeyes


d

Biology & Microbiology

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In the human disease known as lupus, there is an immune reaction against a patient's own DNA from broken or dying cells, which categorizes lupus as _____

A) an allergy B) an immunodeficiency C) an autoimmune disease D) an antigenic variation E) a cancer

Biology & Microbiology

One of a pair of chromosomes with similar genetic information and from different sources like the sperm and egg.  

A.  chiasma B.  homologue C.  kinetochore D.  synapsis E.  synaptonemal

Biology & Microbiology

Four of the five answers are conditions that may help to break dormancy of seeds. Select the exception

a. abrasion of the seed coat b. freezing temperatures c. bright light d. fire e. salty soil conditions

Biology & Microbiology

Influenza strains that sweep around the world often carry names such as H5N1 or  H2N2. If they are both flu viruses, why do they differ in their H and N numbers?

A. The H and N numbers indicate the type of glycoprotein spikes found in the viral envelope. B. The H and N numbers indicate the order in which the virus was discovered. C. The H and N numbers indicate the toxicity of the virus to humans and nonhumans. D. The H and N numbers indicate the geographical region in which the virus was discovered.

Biology & Microbiology