7th Grade Science Review (2006 & 2007 Regents Qs)

The drawings below show four animals.

What do all four animals have in common?

• They reproduce asexually.

• They are composed of cells.

• They have similar means of locomotion.

• They have the same internal structures.

In humans, a fertilized egg contains 46 chromosomes. Which bar graph best represents the number of chromosomes contained in the sperm and egg before they united to make the fertilized egg?

• 1

• 2

• 3

• 4

The diagram below shows a microscopic view of

a one-celled organism. Four cell structures are

labeled.

Which statement about the labeled structures is

correct?

• They normally can be seen without magnification.

• They can survive outside the cell.

• They help carry on life activities within the

  cell.

• They cause disease within the cell.

In the past, Native American Indians buried dead fish along with corn seeds. This technique was used because the decomposing dead fish would

• provide nutrients for the growing corn plant

• eliminate the need for weeding around the

  corn plant

• release oxygen for use by the corn plant

• supply all the water needed by the corn plant

Although change in multicellular species usually

takes thousands of years, some species of bacteria

undergo major changes in just a few years. One

reason for this difference is that these bacteria

• are microscopic

• do not contain DNA

• reproduce very quickly

• cause infectious diseases

The diagram below shows a simple microscope.

Four parts of the microscope are labeled A, B, C,

and D.

Which part of the microscope is used to bring

the image of the object on the slide into focus?

• A

• B

• C

• D

Competition is most likely to occur between which two organisms?

• deer and butterflies

• owls and bacteria

• goldfish and rabbits

• grass and strawberry plants

Many cells have a nucleus that contains chromosomes.

These chromosomes carry genes that are composed of

• hormones

• DNA molecules

• minerals and water

• undigested food molecules

The diagram below shows a human arm bending at the elbow.

Which two body systems most directly cause the arm to bend?

• skeletal and muscular

• reproductive and endocrine

• respiratory and excretory

• nervous and digestive

The illustration below traces the development of the corgi dog over several generations as a result of human activity.

This is an example of the human activity called

• mutation

• genetic engineering

• selective breeding

• natural selection