Question

(2) decrease the number of enzymes in the blood (4) have white blood cells synthesize antibodies

1. an infection in the body result in a sudden

(1) decrease in the activity of antigens produced by the mitochondria
(2) decrease in the amount of dna present in the nuclei of cells
(3) increase in the activity of white blood cells
(4) increase in the number of red blood cells

1. which activity is not a function of white blood cells in response to an invasion of the body by bacteria?

(1) engulfing these bacteria
(2) producing antibodies to act against this type of bacteria
(3) preparing for future invasions of this type of bacteria
(4) speeding transmissions of nerve impulses to detect these bacteria

1. a researcher needs information on antigen - antibody reactions. searching for which phrase would best

lead the researcher to information about these reactions?
(1) protein synthesis (2) energy sources (3) white blood cell activity (4) dna replication

1. a function of white blood cells is to

(1) transport oxygen to body cells (3) produce hormones that regulate cell communication
(2) carry glucose to body cells (4) protect the body against pathogens

1. the diagram below represents what can happen when homeostasis in

an organism is threatened.
which statement provides a possible explanation for these events?
(1) antibiotics break down harmful substances by digestion.
(2) antibodies mark and other cells engulf microbes during immune
reactions.
(3) embryonic development of essential organs occurs during pregnancy.
(4) cloning removes abnormal cells produced during differentiation.

Explanation:

1. Infections trigger immune responses; white blood cells (immune cells) become more active to fight pathogens.
2. White blood cells function in phagocytosis, antibody production, and immunological memory, but not nerve impulse transmission (a nervous system role).
3. Antigen-antibody reactions are core to immune responses, which involve white blood cell activity.
4. White blood cells protect against pathogens (immune function); oxygen transport is by red blood cells, glucose transport by blood plasma, hormone production by endocrine cells.
5. The diagram shows immune cells engulfing microbes; antibodies mark pathogens for engulfment by phagocytes during immune reactions.

Answer:

1. (3) increase in the activity of white blood cells
2. (4) speeding transmissions of nerve impulses to detect these bacteria
3. (3) white blood cell activity
4. (4) protect the body against pathogens
5. (2) Antibodies mark and other cells engulf microbes during immune reactions.