The three domains of life are _______, _______, and Eukarya. The four kingdoms within Eukarya are composed of _______, _______,_______, and _______.
Microbes perform several activities that are critical to the maintenance of other life-forms on Earth. Name three of these activities.
In order to replicate, viruses must invade _______.
What does it mean to be a “successful” organism? Bacteria are certainly the most numerous organisms on Earth, they live in nearly all environments, and they are the least susceptible to being eliminated through environmental catastrophe. Are they Earth’s most successful organisms?
a. produce most of the world’s atmospheric oxygen.
b. make nitrogen available to plants.
c. recycle dead organic matter.
d. account for most of the world’s biomass.
e. All of the above.
a. are the smallest living things.
b. have only one organelle.
c. are beneficial to most organisms.
d. replicate only by invading living cells.
e. have circular chromosomes.
All viruses possess ______, which they
a. toxins; kill cells with
b. cell walls; protect themselves with
c. DNA or RNA; copy inside themselves
d. many cells; insert inside a host cell
e. DNA or RNA; transfer into a host cell
a. are single-celled eukaryotes.
b. live outside cells.
c. reproduce sexually or asexually.
d. are multicelled prokaryotes.
e. are single-celled prokaryotes.
Within the human body, bacteria exist in greatest numbers in the _____, with most of these bacteria having a ______ relationship with their human host.
a. lungs; commensal
b. feet; antagonistic
c. digestive tract; mutualistic
d. digestive tract; pathogenic
e. kidneys; mutualistic
Archaea (select all that apply):
a. are single-celled prokaryotes.
b. are restricted to marine environments.
c. are superficially similar to bacteria.
d. are restricted to extreme environments.
e. constitute one of the three domains of life.
Protists were the first life-forms to (select all that apply);
a. appear on Earth.
b. reproduce through binary fission.
c. reproduce sexually.
d. evolve following bacteria and archaea.
e. exhibit true multicellularity.
Phytoplankton are important because they (select all that apply):
a. produce antibiotics.
b. produce oxygen.
c. sit at the base of terrestrial food chains.
d. sit at the base of aquatic food chains.
e. fight viruses.
Human beings appear to have evolved into their present anatomical form in _______.
Were modern human beings the first hominin species to reach Europe and Asia?
The “Hobbit” people, Homo floresiensis, are thought to have survived until as recently as _______ years ago on an island that is part of present-day _______.
The two most important features in distinguishing hominins from apes are _______ walking and _______ structure.
The “Lucy” hominin was like modern human beings in that she was _______. but unlike them with respect to _______ size.
Lucy shows us that hominin features evolved in a _______ pattern, which is to say that different features evolved at different points in time and in different species.
∫2xcos(x2 – 5).dx
If the sum of 14 terms of an A. P is 1050 its first term is 10 find 20th term ?
Diagonals of a quadrilateral 30 cm long and the perpendicular drawn from the opposite vertices are 5.6 and 7.4 cm find the area of the quadrilateral.with steps ?
Find the sum of the integers between 10 and 30 including 10 and 30 which are not divisible by 3.
A cyclic quadrilateral pqrs are where PS equals to PQ and angle SPQ is 70 degree find angle psq