1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
enot [183]
3 years ago
15

Based on fossil evidence about how long ago did the first single celled life form appear on earth

Biology
2 answers:
kirza4 [7]3 years ago
7 0

about 3.5 billion years ago

mark me brainliest

larisa [96]3 years ago
5 0

The first single celled life form appeared on earth roughly about 3.5 billion years ago

You might be interested in
Red x red (both heterozygous) ____________ (all white; 2 red, 2 white; 3 red, 1 white; all red; ) .
KiRa [710]

Answer:

as the ratio comes to be 3:1

there for answer will be 3 red 1 white

Explanation:

hope it helped u buddy

4 0
3 years ago
Suppose we were successful in identifying 12 mutants using a screen for identifying conditional mutants of S. cerevisiae in whic
Marina CMI [18]

Answer:

Each mutant would be mated to wild type and to every other mutant to create diploid strains. The diploids would be assayed for growth at permissive and restrictive temperature. Diploids formed by mating a mutant to a wild type that can grow at restrictive temperatures identify the mutation as recessive. Only recessive mutations can be studied using complementation analysis. Diploids formed by mating two recessive mutants identify mutations in the same gene if the diploid cannot grow at restrictive temperature (non-complementation), and they identify mutations in different genes if the diploids can grow at restrictive temperature (complementation).

Explanation:

Recessive mutations are those whose phenotypic effects are only visible in homo-zygous individuals. Moreover, a complementation test is a genetic technique used to determine if two different mutations associated with a phenotype colocalize in the same <em>locus</em> (i.e., they are alleles of the same gene) or affect two different <em>loci</em>.  In diploid (2n) organisms, this test is performed by crossing two homo-zygous recessive mutants and then observing whether offspring have the wild-type phenotype. When two different recessive mutations localize in different <em>loci</em>, they can be considered as 'complementary' since the heterozygote condition may rescue the function lost in homo-zygous recessive mutants. In consequence, when two recessive mutations are combined in the same genetic background (i.e., in the same individual) and they produce the same phenotype, it is possible to determine that both mutations are alleles of the same gene/<em>locus</em>.

5 0
2 years ago
Which of the following situations does not call for adjusting your lane position?
arlik [135]
A. The car ahead of you is turning
3 0
2 years ago
Read 2 more answers
The bean plant grown under the green filter will grow taller than the bean plant grown under unfiltered sunlight.
andrew11 [14]
The light needed for photosynthetic reactions tends to be more reds and purple wave lengths. The Green wavelength is reflected. Filtering out the green light will stunt the light reactions of the plant.
5 0
2 years ago
Name the enzyme that breaks down H2O2.. Anybody know?!?!?!?!
Alborosie
The enzyme that breaks down H2O2 is called catalase.
3 0
3 years ago
Other questions:
  • Consider a population of frogs. Allele B1 codes for spotted frogs; allele B2 codes for non-spotted frogs. B1 is dominant to B2 .
    5·2 answers
  • What is the history of species of the Galapagos Islands?
    14·1 answer
  • The pollen of conifers is primarily dispersed by __________.
    6·1 answer
  • What are some common types of hornets?
    11·2 answers
  • What is the water potential of a .20 M solution of sucrose in an open beaker at 23 degrees Celsius?
    12·1 answer
  • What works together to form the eye
    14·1 answer
  • Put the steps of the interaction between actin and
    9·2 answers
  • Give three reasons supported by the text that specialization and interdependence could be considered the keys to homeostasis in
    9·2 answers
  • Quais são as meninges que revestem o Sistema Neural Central? Determine a ordem delas no sentido de dentro para fora.
    5·1 answer
  • Transcribe to mRNA <br><br>translate to amino acid​
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!