Exam 1 Flashcards
Cells are _____.
characteristic of prokaryotic and eukaryotic organisms
Which of the following are statements regarding the complexity of biological systems?
An ecosystem displays complex properties not present in the individual communities
within it. An understanding of the interactions between different components within a living system
is a key goal of a systems biology approach to understanding biological complexity. Knowing the function of a component of a living system can provide insight into its structure and organization.
You find yourself standing next to a beautiful rose bush. Which of the following do you and the rose have in common?
You both are multicellular.
Charles Darwin proposed a mechanism for descent with modification that stated that organisms of a particular species are adapted to their environment when they possess _____.
heritable traits that enhance their survival and reproductive success in the local environment
A friend of yours calls to say that his car would not start this morning. He asks for your help. You say that you think the battery must be dead. If so, then jump‐starting the car from a good battery will solve the problem. In doing so, you are _____.
stating a hypothesis and using that hypothesis to make a testable prediction
Which of the following are qualities of any good scientific hypothesis?
It is testable. It is falsifiable.
Which of the following is the best description of a control for an experiment?
The control group is matched with the experimental group except for one experimental
variable.
About twenty‐five of the ninety‐two natural elements are known to be essential to life. Which four of these twenty‐five elements make up approximately 96 percent of living matter?
carbon, hydrogen, nitrogen, oxygen
Knowing the atomic mass of an element allows inferences about which of the following?
the number of protons plus neutrons in the element
In what way are elements in the same column of the periodic table the same? They have the same number of _____.
electrons in their valence shells when neutral
The atomic number of nitrogen is 7. Nitrogen‐15 has a greater mass number than nitrogen‐14 because the atomic nucleus of nitrogen‐15 contains _____.
8 neutrons
Can the atomic mass of an element vary?
Yes. Adding or losing neutrons will change the atomic mass without forming a different element.
An atom has four electrons in its valence shell. What types of covalent bonds is it capable of forming?
double bonds only
In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by _____.
polar covalent bonds
