Plasmolysis occurs in plant cells when the soil or water contains low concentration of salts or
fertilizers.
__________________ Indicate whether the statement is true or false.
F, high
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The digestive system is concerned with
(a) blood circulation. (b) digestion and the absorption of nutrients. (c) reproduction. (d) excretion of urine.
An F1 organism is always homozygous
Indicate whether the statement is true or false.
The major obstacle to the use of xenotransplants can possibly be overcome by ____
a. giving a series of injections that depress the immune systems of recipients b. changing genetic markers in humans to make them more receptive to nonhuman tissue c. cloning donor animals using human DNA d. introducing a complement genes to both the donor animal and recipient human e. altering the patient’s MHC complex
Protozoa are primarily
A) free-living. B) pathogenic. C) parasitic. D) photosynthetic.