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Biology

Which ecological pyramid is always upright because energy decreases at successive trophic levels?

Pyramid of numbers

Pyramid of biomass

Pyramid of energy

Population pyramid

Biology

Genetic drift has the strongest effect in:

Very large populations

Small populations

Populations with no variation

Populations with unlimited gene flow

Biology

Which process increases genetic variation by introducing new alleles into a population?

Mutation

Stabilizing selection

Genetic drift only

Natural selection alone

Biology

The Hardy-Weinberg principle assumes all of the following EXCEPT:

Random mating

No natural selection

Large population size

Strong mutation pressure

Biology

Which type of selection favors individuals at both extremes of a phenotypic distribution?

Directional selection

Stabilizing selection

Disruptive selection

Artificial selection

Biology

Which protein forms the structural framework of a blood clot?

Hemoglobin

Fibrin

Albumin

Myosin

Biology

Which component of blood is primarily responsible for clot formation?

Erythrocytes

Platelets

Lymphocytes

Plasma

Biology

Which type of immunity develops after vaccination?

Artificial active immunity

Natural passive immunity

Artificial passive immunity

Innate immunity only

Biology

Which cells are primarily responsible for producing antibodies?

T cells

Plasma cells

Neutrophils

Macrophages

Biology

Which immunoglobulin is generally the first antibody produced during a primary immune response?

IgA

IgE

IgG

IgM