Biology regents: 9th grade

Deforestation most directly results in

A decrease in biodiversity in an area

A dead or weakened pathogen used to establish immunity would most likely be found in

A vaccine

The process used to remove excess water from the paramecium by the contractile vacuole is

Active transport

The hormone adrenaline can affect only cells with

Appropriately shaped receptors

In living cells, chemical processes, such as synthesis all require the action of

Biological catalysts

after a zygote is formed, specialization if cells occurs. Through which process do the cells of a zygote become specialized?

Differentiation

Three human hormones most directly involved in sexual reproduction are

Estrogen, progesterone, and testosterone

Nonrenewable resources are

Finite and are depleted over time

The shape of a protein molecule directly determines its

Functions inside and outside of cells

A serious threat to biodiversity is

Habitat destruction

What are the four most abundant elements in all living things

Hydrogen, oxygen, carbon, and nitrogen

What cell structure is responsible for releasing energy from food molecules in some single-celled organisms?

Mitochondrion

Which sequence represents structures organized from least complex to most complex?

Nucleus— nerve cell— brain— nervous system

An ameba, a one called organism, can move, ingest, and transport materials within the cell, because it has

Organelles

The substance produced inside the leaf disks that caused them to float to the surface of the solution is

Oxygen

Which factor would be least likely to contribute to the developement of a new species?

Plentiful resources within the environment occupied by the species

In humans, the placenta is essential to the embryo for

Respiration, nutrition, and excretion

The building blocks for this molecule are

Simple sugars

Which occurrence represents an example of evolution?

Some antibiotics are almost useless, because pathogens have developed a resistance to these antibiotics